Viewer for a door



FIG. 1 is a front elevational view of a viewer for a door showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof taken from the left side of FIG. 1; and

FIG. 5 is a side elevational view thereof taken from the right side of FIG. 1. 

The ornamental design for a viewer for a door, as shown. 